I started up a cooperative multiplayer game with my buddy, and we both had the same mods, I made sure of that.
We played our last game with the reduced movement with naval double time mod and it all worked fine.
But for some reason after booting it up with the edit you did for me with the artillery, it kept saying we were using incompatible versions. We unchecked it and booted it back up, and everything was fine.
Do you have any idea why the movement doubletime artillery pack would be multiplayer incompatible?